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DC Motors

DC Motors
A dc motor can be easily identified by

Yoke
Winding
Size of conductor
Commutator

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DC Motors
If a dc motor is comnected across the AC supply it will

Not run
Burn due to heat produced in the field winding by eddy currents
Run at normal speed
Run at lower speed

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DC Motors
Ward-Leonard control is basically a

Field control method
Armature resistance control method
Field divertor method
Voltage control method

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DC Motors
In dc machines fractional pitch winding is used

To reduce the generated emf
To improve cooling
To reduce the sparking
To increase the generated emf

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DC Motors
A three point starter is considered suitable for

Shunt as well as compound motors
Shunt motors
All D.C. motors
Shunt, compound and series motors

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DC Motors
A series motor will over speed when

The armature circuit is opened.
Load is removed
The load is increase
The field is opened

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